Engineering Materials Practice Set-8

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1. The hardness of steel increases if it contains

Martensite

Cementite

Austenite

Pearlite

2. Beryllium bronze has

(A) High yield point

(C) Both (A) and (B)

(D) None of these

(B) High fatigue limit

3. Corrosion resistance of steel is increased by adding

Chromium and nickel

Aluminium and zinc

Nickel and molybdenum

Tungsten and sulphur

4. Drop forging dies contain carbon of the order of

0.25 to 0.5%

0.6 to 0.7%

0.1 to 0.2%

0.7 to 0.9%

5. Which is false statement about tempering? Tempering is done to

Improve toughness

Release stresses

Improve ductility

Improve machinability

6. Compressive strength of grey cast iron in tonnes/cm is of the order of

1015

710

35

57

7. Bronze contains

70 - 75% copper and rest tin

90% copper and 10% tin

85 - 92% copper and rest tin with little lead and nickel

70% copper and 30% zinc

8. High carbon steel carries carbon percentage

0.8 to 1.5%

0.1 to 0.3%

0.3 to 0.6%

0.6 to 0.8%

9. The alloy used for making electrical resistances and heating elements is

Magnin

Elinvar

Nichrome

Invar

10. The crystal structure of brass is

B.C.C.

F.C.C.

Orthorhombic crystalline structure

H.C.P.

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11. Permalloy is a

Kind of stainless steel

None ferrous alloy

Nickel and iron alloy having high permeability

Polymer

12. Free cutting steels

Require least cutting force

Are used where ease in machining is the criterion

Do not exist

Contain carbon in free form

13. Melting point of iron is

1539°C

1601°C

1712°C

1489°C

14. Cold rolled steel sheets contain carbon of the following order

0.4%

0.2%

0.1%

0.6%

15. Nimonic contains __________ percentage of nickel as that of Inconel.

More

None of these

Same

Less

16. Preheating is essential in welding

High speed steel

All of the above

All nonferrous materials

Cast iron

17. Argentite is the principal ore or raw material for

Tin

Aluminium

Zinc

Silver

18. Shock resisting steels should have

Low wear resistance

Low tensile strength

Toughness

Low hardness

19. The presence of sulphur in pig iron makes

It brittle

It easily machinable

The casting unsound

It hard

20. Aluminium bronze contains aluminium and copper in the ratio of

40 : 60

60 : 40

10 : 90

50 : 50

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21. The machinability of steel is increased by

Phosphorous, lead and sulphur

Silicon and sulphur

Phosphorous and aluminium

Sulphur, graphite and aluminium

22. Gun metal contains

85 - 92% copper and rest tin with little lead and nickel

70 - 78% copper and rest tin

70% copper and 30% zinc

90% copper and 10% tin

23. Manganese in steel increases its

Ductility

Hardness

Fluidity

Tensile strength

24. Phosphor bronze contains

None of the above

0.5% of phosphorous

2.5% phosphorous

1% phosphorous

25. Delta metal is an alloy of

Iron, lead and tin

Iron, aluminium and magnesium

Iron, nickel and copper

Copper, zinc and iron

26. An example of amorphous material is

Zinc

Silver

Glass

Lead

27. The hardness is the property of a material due to which it

Can cut another metal

Can be drawn into wires

Can be rolled or hammered into thin sheets

Breaks with little permanent distortion

28. Steel made from phosphate iron is

Hard

Ductile

Tough

Brittle

29. Hardness of upper bainite (acicular structure) is about

RC 57

RC 65

RC 48

RC 80

30. Tungsten in high speed steel provides

Sharp cutting edge

Hot hardness

Toughness

Wear resistance

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31. Connecting rod is usually made of

Low carbon steel

Medium carbon steel

Aluminium

High carbon steel

32. Which of the following is used for bearing liner?

Gun metal

Bell metal

Babbitt metal

Bronze

33. The alloying element which reduces the formation of iron sulphide in steel is

Manganese

Chromium

Vanadium

Nickel

34. Which of the following is the binding material in cemented carbides?

Cobalt

Nickel

Iron

Vanadium

35. Weld decay is the phenomenon found with

Mild steel

Cast iron

Stainless steel

Nonferrous materials

36. Carbon in iron is an example of

Intermetallic compounds

All of the above

Interstitial solid solution

Substitutional solution

37. Cupola produces following material

Malleable iron

Cast iron

Pig iron

Wrought iron

38. Perminvar alloy having constant permeability is an alloy of

Nickel, copper and zinc

Iron, zinc and bismuth

Nickel, copper and iron

Copper, nickel and antimony

39. Sulphur in cast iron

Aids fusibility and fluidity

Makes the iron soft and easily machinable

Increases hardness and brittleness

Make the iron white and hard

40. Chromium in steel

Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties

Improves wear resistance, cutting ability and toughness

Gives ductility, toughness, tensile strength and anti-corrosion properties

Improves cutting ability and reduces hardenability

Engineering Materials Practice Set-8

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